X3 is much more fluid than 950 XL

[rdubmu]

I have noticed that window 10 Mobile and it's apps performance is much better on the x3 verses the Lumia 950XL. The Lumia 950 XL is choppy while the X3 is buttery smooth

 

[xandros9]

Of course there's some other factors at play but the X3 is a more powerful device so I don't think that'll be unexpected. Unless your XL is performing below what it should.